Disclosed is a method for a wireless device for transmitting a random-access preamble. The method may comprise the steps of: generating a sequence of a random-access preamble; and mapping the sequence of a random-access preamble to one sub-carrier wave from among 12 sub-carrier waves of a frequency domain. The mapping step may comprise the step for carrying out a first hop between a plurality of sub-regions. Each sub-region may comprise a previously set number of sub-carrier waves. The mapping step may additionally comprise the step for carrying out a second hop from among the sub-carrier waves within any one sub-region.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A method for transmitting a random access preamble, the method performed by a wireless device and comprising: performing a single tone transmission of the random access preamble, wherein the single tone transmission of the random access preamble uses a 3.75 kHz subcarrier spacing and includes: generating a sequence of the random access preamble; mapping the sequence of the random access preamble onto one subcarrier among 12 subcarriers in a frequency domain; and transmitting the sequence of the random access preamble which is mapped onto the one subcarrier; wherein the mapping of the sequence of the random access preamble includes: performing a first hopping among plural groups, each of which includes a pre-configured number of subcarriers, and performing a second hopping among the pre-configured number of subcarriers in one group of the plural groups.
2. The method of claim 1 , wherein the performing of the first hopping comprises: selecting one group among the plural groups; and performing a hopping into the selected group.
3. The method of claim 2 , wherein the performing of the second hopping comprises: selecting one subcarrier among plural subcarriers included in the selected group; performing the hopping into the selected subcarrier; and mapping the sequence of the random access preamble onto the selected subcarrier.
4. The method of claim 1 , further comprising: receiving information on one or more of the plural groups via a higher layer signal.
5. The method of claim 4 , wherein the information on one or more of the plural groups received via the higher layer signal includes information on the pre-configured number of the subcarriers included in each group.
6. The method of claim 5 , wherein the information on one or more of the plural groups received via the higher layer signal includes information on a frequency offset.
7. The method of claim 1 , wherein the sequence of the random access preamble is generated based on an identifier of a narrowband internet of things (NB-IoT).
8. The method of claim 1 , further comprising: receiving a physical downlink control channel (PDCCH) order for triggering a transmission of the random access preamble.
9. The method of claim 8 , wherein the PDCCH order includes downlink control information (DCI) including information on the subcarrier on which the random access preamble is transmitted.
10. A wireless device for transmitting a random access preamble, the wireless device comprising: a transceiver; and a processor configured to control the transceiver and configured to: perform a single tone transmission of the random access preamble, wherein the single tone transmission of the random access preamble uses a 3.75 kHz subcarrier spacing and includes: generating a sequence of the random access preamble; mapping the sequence of the random access preamble onto one subcarrier among 12 subcarriers in a frequency domain, transmitting the sequence of the random access preamble which is mapped onto the one subcarrier; wherein the mapping of the sequence of the random access preamble includes: performing a first hopping among plural groups, each of which includes a pre-configured number of subcarriers, and performing a second hopping among the pre-configured number of subcarriers in one group of the plural groups.
11. The wireless device of claim 10 , wherein for performing the first hopping, the processor is further configured to: select one group among the plural groups; and perform a hopping into the selected group.
12. The wireless device of claim 11 , wherein for performing the second hopping, the processor is further configured to: select one subcarrier among plural subcarriers included in the selected group; perform the hopping into the selected subcarrier; and map the sequence of the random access preamble onto the selected subcarrier.
13. The wireless device of claim 10 , wherein the transceiver is configured to: receive information on one or more of the plural groups via a higher layer signal.
14. The wireless device of claim 10 , wherein the transceiver is configured to: receive a physical downlink control channel (PDCCH) order for triggering a transmission of the random access preamble.
15. The wireless device of claim 14 , wherein the PDCCH order includes downlink control information (DCI) including information on the subcarrier on which the random access preamble is transmitted.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
November 29, 2016
August 11, 2020
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